Being that Exxor is in a far away galaxy, Superman flies there and is able to maintain his super powers during the entire journey as well as on Exxor.
Planet Exxor is located in a far distant galaxy from Earth, yet the Superfriends are able to get there in a very short time in the chemically propelled Bat Rocket and Invisible Jet.
Wonder Woman is able to stand on her invisible jet and lasso two of Rokan's fighter ships without any protection from the coldness and vacuum of space, and while the jet is flying at high speed.